404 KANSAS UNIVERSITY. SCIENCE BULLETIN. 
Femur-rubrum and atlanis are so similar in body form that 
they are easily mistaken for each other. Size, coloring and 
shape are alike, the distinction lying in the podical plates only. 
The chromosome complexes of the two species are, however, 
not as similar as those of femwur-rubrum and differentialis. 
Between the two latter is a marked difference in body size, yet 
the chromosomes are the same in size and shape. There is no 
size difference in the chromosomes of M. femur-rubrum and 
M. atlanis, but the form of atlanis chromosomes is more ir- 
regular. 
On the whole, the close resemblance between the complexes 
of the five species examined supports the belief that there is 
correlation between chromosomes and body characters. 
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